/**
 * --------------------------------------------------------------------------
 * Bootstrap (v4.3.1): button.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * --------------------------------------------------------------------------
 */

import $ from 'jquery'

/**
 * ------------------------------------------------------------------------
 * Constants
 * ------------------------------------------------------------------------
 */

const NAME = 'button'
const VERSION = '4.3.1'
const DATA_KEY = 'bs.button'
const EVENT_KEY = `.${DATA_KEY}`
const DATA_API_KEY = '.data-api'
const JQUERY_NO_CONFLICT = $.fn[NAME]

const ClassName = {
    ACTIVE: 'active',
    BUTTON: 'btn',
    FOCUS: 'focus'
}

const Selector = {
    DATA_TOGGLE_CARROT: '[data-toggle^="button"]',
    DATA_TOGGLE: '[data-toggle="buttons"]',
    INPUT: 'input:not([type="hidden"])',
    ACTIVE: '.active',
    BUTTON: '.btn'
}

const Event = {
    CLICK_DATA_API: `click${EVENT_KEY}${DATA_API_KEY}`,
    FOCUS_BLUR_DATA_API: `focus${EVENT_KEY}${DATA_API_KEY} ` +
        `blur${EVENT_KEY}${DATA_API_KEY}`
}

/**
 * ------------------------------------------------------------------------
 * Class Definition
 * ------------------------------------------------------------------------
 */

class Button {
    constructor(element) {
        this._element = element
    }

    // Getters

    static get VERSION() {
        return VERSION
    }

    // Public

    toggle() {
        let triggerChangeEvent = true
        let addAriaPressed = true
        const rootElement = $(this._element).closest(
            Selector.DATA_TOGGLE
        )[0]

        if (rootElement) {
            const input = this._element.querySelector(Selector.INPUT)

            if (input) {
                if (input.type === 'radio') {
                    if (input.checked &&
                        this._element.classList.contains(ClassName.ACTIVE)) {
                        triggerChangeEvent = false
                    } else {
                        const activeElement = rootElement.querySelector(Selector.ACTIVE)

                        if (activeElement) {
                            $(activeElement).removeClass(ClassName.ACTIVE)
                        }
                    }
                }

                if (triggerChangeEvent) {
                    if (input.hasAttribute('disabled') ||
                        rootElement.hasAttribute('disabled') ||
                        input.classList.contains('disabled') ||
                        rootElement.classList.contains('disabled')) {
                        return
                    }
                    input.checked = !this._element.classList.contains(ClassName.ACTIVE)
                    $(input).trigger('change')
                }

                input.focus()
                addAriaPressed = false
            }
        }

        if (addAriaPressed) {
            this._element.setAttribute('aria-pressed', !this._element.classList.contains(ClassName.ACTIVE))
        }

        if (triggerChangeEvent) {
            $(this._element).toggleClass(ClassName.ACTIVE)
        }
    }

    dispose() {
        $.removeData(this._element, DATA_KEY)
        this._element = null
    }

    // Static

    static _jQueryInterface(config) {
        return this.each(function() {
            let data = $(this).data(DATA_KEY)

            if (!data) {
                data = new Button(this)
                $(this).data(DATA_KEY, data)
            }

            if (config === 'toggle') {
                data[config]()
            }
        })
    }
}

/**
 * ------------------------------------------------------------------------
 * Data Api implementation
 * ------------------------------------------------------------------------
 */

$(document)
    .on(Event.CLICK_DATA_API, Selector.DATA_TOGGLE_CARROT, (event) => {
        event.preventDefault()

        let button = event.target

        if (!$(button).hasClass(ClassName.BUTTON)) {
            button = $(button).closest(Selector.BUTTON)
        }

        Button._jQueryInterface.call($(button), 'toggle')
    })
    .on(Event.FOCUS_BLUR_DATA_API, Selector.DATA_TOGGLE_CARROT, (event) => {
        const button = $(event.target).closest(Selector.BUTTON)[0]
        $(button).toggleClass(ClassName.FOCUS, /^focus(in)?$/.test(event.type))
    })

/**
 * ------------------------------------------------------------------------
 * jQuery
 * ------------------------------------------------------------------------
 */

$.fn[NAME] = Button._jQueryInterface
$.fn[NAME].Constructor = Button
$.fn[NAME].noConflict = () => {
    $.fn[NAME] = JQUERY_NO_CONFLICT
    return Button._jQueryInterface
}

export default Button